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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2017 Intel Corporation
*/
#include <rte_mbuf.h>
#include "rte_distributor_private.h"
#include "rte_distributor.h"
#include "smmintrin.h"
#include "nmmintrin.h"
void
find_match_vec(struct rte_distributor *d,
uint16_t *data_ptr,
uint16_t *output_ptr)
{
/* Setup */
__m128i incoming_fids;
__m128i inflight_fids;
__m128i preflight_fids;
__m128i wkr;
__m128i mask1;
__m128i mask2;
__m128i output;
struct rte_distributor_backlog *bl;
uint16_t i;
/*
* Function overview:
* 2. Loop through all worker ID's
* 2a. Load the current inflights for that worker into an xmm reg
* 2b. Load the current backlog for that worker into an xmm reg
* 2c. use cmpestrm to intersect flow_ids with backlog and inflights
* 2d. Add any matches to the output
* 3. Write the output xmm (matching worker ids).
*/
output = _mm_set1_epi16(0);
incoming_fids = _mm_load_si128((__m128i *)data_ptr);
for (i = 0; i < d->num_workers; i++) {
bl = &d->backlog[i];
inflight_fids =
_mm_load_si128((__m128i *)&(d->in_flight_tags[i]));
preflight_fids =
_mm_load_si128((__m128i *)(bl->tags));
/*
* Any incoming_fid that exists anywhere in inflight_fids will
* have 0xffff in same position of the mask as the incoming fid
* Example (shortened to bytes for brevity):
* incoming_fids 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08
* inflight_fids 0x03 0x05 0x07 0x00 0x00 0x00 0x00 0x00
* mask 0x00 0x00 0xff 0x00 0xff 0x00 0xff 0x00
*/
mask1 = _mm_cmpestrm(inflight_fids, 8, incoming_fids, 8,
_SIDD_UWORD_OPS |
_SIDD_CMP_EQUAL_ANY |
_SIDD_UNIT_MASK);
mask2 = _mm_cmpestrm(preflight_fids, 8, incoming_fids, 8,
_SIDD_UWORD_OPS |
_SIDD_CMP_EQUAL_ANY |
_SIDD_UNIT_MASK);
mask1 = _mm_or_si128(mask1, mask2);
/*
* Now mask contains 0xffff where there's a match.
* Next we need to store the worker_id in the relevant position
* in the output.
*/
wkr = _mm_set1_epi16(i+1);
mask1 = _mm_and_si128(mask1, wkr);
output = _mm_or_si128(mask1, output);
}
/*
* At this stage, the output 128-bit contains 8 16-bit values, with
* each non-zero value containing the worker ID on which the
* corresponding flow is pinned to.
*/
_mm_store_si128((__m128i *)output_ptr, output);
}
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